Headphone



FIG. 1 is a perspective view of a headphone according to an embodiment of the claimed design;

FIG. 2 is a front elevational view of the headphone of FIG. 1;

FIG. 3 is a rear view elevational view of the headphone of FIG. 1;

FIG. 4 is a left elevational view of the headphone of FIG. 1;

FIG. 5 is a right elevational view of the headphone of FIG. 1;

FIG. 6 is a top elevational view of the headphone of FIG. 1; and,

FIG. 7 is a bottom elevational view of the headphone of FIG. 1. 

CLAIM The ornamental design for headphone, as shown and described. 